How do I enter coordinates?

The main screen has a bar near the top showing Latitude, Longitude, and
Maidenhead coordinates in blue, underlined text. Tapping that text will
cause keypads to appear, from which you may enter coordinates.

How do I track my current location?

Tap the arrow button in the lower-left corner of the main screen. The first
time you tap the button, iOS will ask you to grant Maidenhead Converter
permission to see your location.

I denied the app permission to track my location ...

If you didn't mean to deny the app permission to track your location, you
must go into the Settings app on your device to enable it.

From the Settings app, choose Privacy, then choose Location Services, then
choose Maidenhead Converter. From that screen you can control Maidenhead
Converter's access to your location.

How can I view the coordinates of a point on the map?

Press and hold on the map over the desired location. The map pin will drop
at that point, and the coordinate values will update.

How do I change the coordinate value formats?

Tap the gear icon in the top-left corner of the main screen. This will take
you to Maidenhead Converter's settings. From there you can customize the
format for Maidenhead and Latitude/Longitude coordinates.